Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 4    April 2012

[PDF Download]    [Flash Online]    

    

Electrochemical corrosion of Sn−0.75Cu solder joints in NaCl solution
GAO Yan-fang1, CHENG Cong-qian1, ZHAO Jie1, WANG Li-hua1, LI Xiao-gang2

1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;
2. School of Materials Science and Engineering, Beijing University of Science and Technology,
Beijing 100083, China

Abstract:The corrosion behaviors of Sn−0.75Cu solder and Sn−0.75Cu/Cu joint in 3.5% NaCl (mass fraction) solution were studied by potentiodynamic polarization test and leaching measurement. The polarization curves indicated that the corrosion rate of Sn−0.75Cu solder was lower than that of Sn−0.75Cu/Cu joint. The morphology observation and phase composition analysis on the corroded product at each interesting potential suggested that Sn3O(OH)2Cl2 formed on the surface of Sn−0.75Cu solder at active dissolution stage. As the potential increased from active/passive transition stage, all the surface of Sn−0.75Cu solder was covered by the Sn3O(OH)2Cl2 and some pits appeared after the polarization test. Compared to the Sn−0.75Cu solder alloy, much more Sn3O(OH)2Cl2 formed at active dissolution stage and the pits with bigger size were observed after polarization test for the Sn−0.75Cu/Cu solder joints. The leaching test confirmed that the faster electrochemical corrosion rate resulted in the larger amount of Sn released from the Sn−0.75Cu/Cu solder joints.

 

Key words: Sn−0.75Cu solder; Sn−0.75Cu/Cu joint; corrosion; potentiodynamic polarization; leaching behavior; corroded products

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com